I often have to go back and check what I did on a single specific date. It is possible to do so using -d 30 and -u 29, for example, or to specify a date range using -A and -B, but that is cumbersome if you need to check multiple dates.

My suggestion is a flag (maybe -O = on) to search on a single specific date.

Example for results on 2026年01月05日:

Instead of doing

git standup -A 2026年01月05日 -B 2026年01月06日

one could use

git standup -O 2026年01月05日